Referencia web
Gráfico de Introducción
http://blog.globalestrategias.es/wp-content/uploads/2015/03/excel.jpg
Torta de ventas de comida
http://i.technet.microsoft.com/dynimg/IC46671.gif
Diana de Objetivos
Tabla
http://www.guidesandtutorials.com/image-files/excell_2003_sample_spreadsheet.gif
Falso o Verdadero
Visicalc
https://upload.wikimedia.org/wikipedia/commons/7/7a/Visicalc.png
Llotus 123
https://upload.wikimedia.org/wikipedia/en/e/ec/Lotus-123-3.0-dos.png
Excel 1.0
http://farm3.static.flickr.com/2429/3635573389_7a34b231a2_o.jpg
Excel 2013
http://cdn1.tnwcdn.com/wp-content/blogs.dir/1/files/2014/02/Power-View.png
Suma
Formula
http://lh5.ggpht.com/_W8YChuXGYW8/SlkdhdtaJaI/AAAAAAAAARI/a5Px3CgHOJU/image%5B18%5D.png?imgmax=800
Formula
https://i.ytimg.com/vi/Hyi0lDeeb7s/maxresdefault.jpg
Función
http://itecnon.com/blogitecnon/wp-content/uploads/2013/02/1.png
Graficos
http://image.slidesharecdn.com/graficosexcel-120523212216-phpapp01/95/graficos-excel-2-728.jpg?cb=1337808618